FORMATION OF DISPERSIONS USING "FLOW FOCUSING" IN MICROCHANNELS
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摘要: 在微流控器件内集成具有流动汇聚功能的几何结构以研究液--液系统中液滴的形成.相图显示液滴的大小为流量以及两种液体流量比的函数, 它包括两个区域,在一个区域中液滴大小和孔隙宽度接近,而在另一区域液滴大小则取决于``汇聚''后的细流直径,从而能形成远小于孔隙的液滴. 单分散和多分散乳状液均可以被生成.Abstract: A flow-focusinggeometry is integrated into a microfluidic device and used tostudy drop formation in liquid-liquid systems. A phase diagramillustrating the drop size as a function of flow rates and flow rate ratios of the two liquids includes one regime where drop size is comparable to orifice width and a second regime where drop size is dictated by the diameter of a thin ``focused'' thread, so drops much smaller than the orifice are formed. Both monodisperse and polydisperseemulsions can be produced.
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